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Leaf patterns, leaf size and ecologically related traits in high Mediterranean mountain on the Moroccan High Atlas

机译:摩洛哥高图集上地中海高山上的叶型,叶大小和生态相关性状

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Leaf traits functional relationship is particularly important in plant ecological strategies, but few data are available from Mediterranean high-altitude environments. We analysed leaf general patterns and leaf trait relationships in 84 perennial species on the High Atlas, Morocco. We examined the correlation amongst leaf size, leaf width and length, plant height and seed size, analysed multi-trait relationships using Structural Equation Models and tested leaf size variation amongst growth forms (functional groups). Species spanned 10(3) range of leaf size (sub-lepto- to microphylls). Nanophylls (48.8%) were dominant and over-represented in half-shrubs. Tree and rosette herbs were more likely to have large leaf size (nano-micro- and microphylls), whereas shrubs have medium leaf size (nano-micro- and nanophylls) and cushion and half-shrubs have small (sub-lepto- to nanophylls) and narrow leaves. Small-leaved species synchronized their leaf phenological activity with the dry summer months (May-August), and large-leaved species extended throughout the spring until the end of summer following the similar patterns found in lowland Mediterranean environments. Regarding woody species, our results showed a positive and significant relationship between leaf size and plant height and a non-significant relationship between leaf size and seed size. Structural Equation Models showed that variation in leaf size was triggered chiefly by changes in leaf form (leaf width) and plant height, seed size being of no relevance. In our study area, large-seeded species have a relatively wide range of leaf size. The hypothesis that the combination of large seeds and small leaves is allometrically unlikely (except for leptophyll Conifers) was supported in this study.
机译:叶片性状的功能关系在植物生态策略中尤为重要,但地中海高海拔环境中的数据很少。我们分析了摩洛哥高图集上84个多年生植物的叶片一般模式和叶片性状关系。我们检查了叶片大小,叶片宽度和长度,植物高度和种子大小之间的相关性,使用结构方程模型分析了多性状关系,并测试了生长形式(功能组)之间的叶片大小变化。物种的叶片大小跨越10(3)范围(亚鳞状到小叶)。纳米叶(48.8%)在半灌木中占主导地位,且含量过高。乔木和莲座丛的叶片更可能具有较大的叶片尺寸(纳米微叶和微叶),而灌木具有中等叶片的尺寸(纳米微叶和纳米叶),垫层和半灌木的叶片较小(亚鳞片至纳米叶) )和窄叶。小叶物种与干旱的夏季月份(5月至8月)同步其叶片物候活动,而大叶物种则遵循在低地地中海环境中发现的相似模式,在整个春季一直延伸到夏季结束。关于木本植物,我们的结果显示叶大小与植物高度之间存在正相关和显着关系,而叶大小与种子大小之间无显着关系。结构方程模型表明,叶片大小的变化主要是由叶片形状(叶宽)和植物高度的变化触发的,种子大小无关。在我们的研究区域中,大种子物种的叶片大小范围相对较大。这项研究支持以下假设:大种子和小叶子的组合在立体角度上是不可能的(除叶叶针叶树以外)。

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